Looking on the Gadmin tools web site it appears that gsamba for
Mandriva/Debian is no more and they only support Fedora/RedHat. At
least the link to download is gone.

The latest version is 0.3.1 but only available as RPM download. Alien
might be able to convert to a Deb for install into your Kubuntu ?

Since Gadmin causes problems it's time to look for an alternative in
your Kubuntu if you can't get the latest version installed via Alien
??